/Engine/Source/Runtime/Engine/Classes/Materials/MaterialExpressionVectorParameter.h
class UMaterialExpressionVectorParameter : public [UMaterialExpressionParameter](API\Runtime\Engine\Materials\UMaterialExpressionParameter)
bool
bUseCustomPrimitiveData
FParameterChann...
ChannelNames
FLinearColor
DefaultValue
uint8
PrimitiveDataIndex